Ford: door alarm, ford taurus, 1998 ford taurus

Question
1998 Ford Taurus
I get an intermittent open door alarm, not momentary, usually hours or days and then it goes away. (All doors are securely shut)I would like to isolate it to a particular door switch but cannot figure out how to do it. Any help will be appreciated  

Answer
John the best way ie to go to  I know you don't want to but the dealer has a tool which they can ck all the doors to see which one is not working or you can get yourself a DVOM  meter and access the GEM module and ck it pin by pin. if you want the pin point just let me know .